Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Association between tobacco use and the number of positive lymph nodes.
| Parameter | Tobacco | Non-tobacco | T-value | P-value (two-tailed) |
|---|---|---|---|---|
| Mean number of positive lymph nodes | 3.2 | 2.0 | 2.10 | 0.04a |
| Square deviation | 16.5 | 3.1 | ||
| Number of patients | 53 | 138 |
P<0.05.
